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Direct drive turntables have electronically controlled speed. If the records you are playing are warped (not flat) that will cause wow & flutter. If that's not the problem then you might try connecting the turntable to a different power outlet using a long extension cord. Failing that, the turntable needs repair.

The unit either needs a new belt, Capstan bearing oiling as in taking the flywheel out and if this does not fix it a new capstan motor. The motor is adjustable with a small screw driver provided you have the appropriate wow and flutter meter and test tape to do the job.

The speed should be adjustable but the common practice is to use a frequency counter and test tape or test tape and wow and flutter meter. I look at this from a Technician's point of view as I have been fixing units for 45 years so far. Once the motor speed control is found it does not take too long. Sometime it take more time taking the cover off.

You get the belt kit from Marrs Communications and then take the unit apart and put them in. After putting new belts into a mechanism the next test is to set the speed to the correct value using a wow and flutter meter or a frequency counter and speed alignment tape. This is why belts are usually installed by a Tape Deck Technician. I hear the complaint all the time that I changed belts and my deck does not work now- well that is why they are changed by a Technician, he will oil the bearings, lubricate the mechanism and install the belts in the right place without breaking anything. It is not always a 5 minute job. That is why they charge for this because it take a few years of doing them before you are good at it.Like I have told others- dual cassette decks usually do not warrant the cost of a repair and most of them are considered throw away.As to the direct answer to you question -there is no manual that gives you step by step instructions- at least in 40 plus years of working on decks- I have never seen one.

Well these machines are not always easy to put parts into and there are some things to do that are not written in the manuals even if you get them. Often times the transport has to come out of the unit and then brackets and motor plates have to be removed to access the belts. This is just the reality of the job and why it can take so much time to do it. Just replacing belts in a machine does not guarantee that the unit will work well just from those belts. New belt will allow the torque to be transferred but the speed of the motor still needs to be set and wow and flutter measurements to determine if the deck is usable. Some belts of the wrong type will result in high wow and flutter. It depends on oiling and belt tension and if the reel torques are correct.The real answer to your question is not how you put the belts in but that you need to have it worked on my a Technician who knows what they are doing. Most deck owners are not set up with experience or equipment to get the correct job done.

Usually on the back of the servo motor. You need a speed alignment tape and frequency counter or wow and flutter meter to do this adjustment correctly. Often times the speeds go up as the motor start to fail.

Belts for decks are universal, there are plenty of places on the web selling them. Parts for a Denon from 25 years ago is another matter. However I think you might need only the belts, as the longer tapes speed problems suggest that it's the load that's causing the belts to struggle. All you need to do is measure the diameter of any belts for replacement. HOWEVER before you remove them make a note, or photographer, how and where they fit.
Use Servisiol Video 40 to clean the rollers and head.

I have a counterpoint to the above statement. BarryMusic is correct that the AVERAGE cassette deck is worth about $20 bucks. You know, those piano keyed wow and flutter hiss monsters made from plastic Tupperware bins. However, the AKAI GX-F91 was at the pinnacle of cassette deck technology, just predating the release of CD. While never quite reaching the cult status of the Nakamichi Dragon or a few Studer Revox units, a drab one will easily fetch $200-$400 dollars as a PARTS MACHINE. A fully restored GX-F91 in the right market (Japan, Europe, the Middle East) can go NORTH of $1000. An all time high I saw was $1717 for a cherry machine. http://www.audio-extasa.eu/akai-gxf91-cassette-deck-p-648.html